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Loans and Allowance for Loan Losses - Outstanding Balance of Loans (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans $ 77,314 $ 78,921    
Total loans held for investment (77,551) (79,257)    
Allowance for loan losses (639) (723) $ (540) $ (569)
Loans Held for Investment, net 76,912 78,534    
Loans covered under a loss share agreement with FDIC 11 19    
Unamortized discounts and premiums and deferred fees and costs 180 102    
Purchased credit-impaired loans        
Loans disclosures        
Purchased credit-impaired loans 237 336    
Commercial        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 43,986 48,326    
Commercial | Commercial and industrial        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 25,337 30,214    
Commercial | Commercial mortgage        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 14,547 13,904    
Commercial | Construction        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 2,283 2,297    
Commercial | Lease financing        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 1,819 1,911    
Consumer        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 33,328 30,595    
Consumer | Residential mortgage        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans 29,836 27,344    
Consumer | Home equity and other consumer loans        
Loans disclosures        
Total loans held for investment, before purchased credit-impaired loans $ 3,492 $ 3,251